Institute of Cosmology and Gravitation, University of Portsmouth, Portsmouth PO1 3FX, United Kingdom.
Phys Rev Lett. 2015 Nov 13;115(20):201101. doi: 10.1103/PhysRevLett.115.201101. Epub 2015 Nov 10.
The most general scalar-tensor theories of gravity predict a weakening of the gravitational force inside astrophysical bodies. There is a minimum mass for hydrogen burning in stars that is set by the interplay of plasma physics and the theory of gravity. We calculate this for alternative theories of gravity and find that it is always significantly larger than the general relativity prediction. The observation of several low mass red dwarf stars therefore rules out a large class of scalar-tensor gravity theories and places strong constraints on the cosmological parameters appearing in the effective field theory of dark energy.
最一般的引力标量-张量理论预言天体内部引力的减弱。恒星内部的氢燃烧存在一个最小质量，它由等离子体物理和引力理论的相互作用所确定。我们针对其他引力理论计算了这个质量，并发现它总是显著大于广义相对论的预言值。因此，对若干低质量红矮星的观测排除了一大类标量-张量引力理论，并对暗能量有效场论中出现的宇宙学参数施加了严格的限制。
